/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineSessionDelegates.h
Delegate fired when StartMatchmaking completes Related to FOnMatchmakingComplete, but this is not a broadcast delegate
typedef TBaseDelegate_ThreeParams< void, [FName](API\Runtime\Core\UObject\FName), const struct [FOnlineError](API\Plugins\OnlineSubsystem\FOnlineError) &, const struct [FSessionMatchmakingResults](API\Plugins\OnlineSubsystem\Interfaces\FSessionMatchmakingResults) & > FOnStartMatchmakingComplete